uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Strong lensing by subhalos in the dwarf galaxy mass range. I. Image separations
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
Show others and affiliations
2008 (English)In: Astrophysical Journal, ISSN 0004-637X, Vol. 684, no 2, 804-810 p.Article in journal (Refereed) Published
Abstract [en]

The cold dark matter scenario predicts that a large number of dark subhalos should be located within the halo of each Milky Way-sized galaxy. One telltale signature of such dark subhalos could be additional milliarcsecond-scale image splitting of quasars previously known to be multiply imaged on arcsecond scales. Here we estimate the image separations for the subhalo density profiles favored by recent N-body simulations and compare these to the angular resolution of both existing and upcoming observational facilities. We find that the image separations produced are very sensitive to the exact subhalo density profile assumed, but in all cases they are considerably smaller than previous estimates based on the premise that subhalos can be approximated by singular isothermal spheres. Only the most optimistic subhalo models produce image separations that would be detectable with current technology, and many models produce image separations that will remain unresolved with all telescopes expected to become available in the foreseeable future. Detections of dark subhalos through image-splitting effects will therefore be far more challenging than currently believed, albeit not necessarily impossible.

Place, publisher, year, edition, pages
2008. Vol. 684, no 2, 804-810 p.
Keyword [en]
dark matter, galaxies : dwarf, galaxies : halos, gravitational lensing, quasars : general
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-109072ISI: 000258889000004OAI: oai:DiVA.org:uu-109072DiVA: diva2:248792
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2009-10-09Bibliographically approved

Open Access in DiVA

No full text

By organisation
Department of Astronomy and Space Physics
In the same journal
Astrophysical Journal
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 195 hits
ReferencesLink to record
Permanent link

Direct link